Stopping mechanism for looms



Feb. 26, 1929. 1,703,659

'H. A. DAVIS STOPPING MECHANISM FOR LOOMS Filed July 12, 1927 3 Sheets-Sheet 1 /NVE TOR.

ATTORNE Y Feb. 26, 1929. 1,703,659 I H. A. DAVIS STOPPING MECHANI SM FOR LOOIS Filed July 12, 1927 3 Sheets-Sheet 2 /N l [NTOR (fl g Q.M 5y

A TORNEY Feb. 26, 1929. 1,703,659

H. A. DAVIS STOPPING MECHANISM FOR LOOMS Filed July 12, 1927 i5 Sheets-Sheet 3 ATTQRNE Y Patented Feb. 26, 1929.

UNITED STATES PATENT OFFICE.

HARRY A. DAVIS, 01 HOPEDALE, MASSACHUSETTS, ASSIGNOR. TO DRAPER CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF. MAINE.

STOPPING MECHANISM FOR. LOOMS.

Application filed July 12,

This invention relates to looms and more particularly to means for stopping the loom on the occurrence of a warp or a weft fault.

It is now the common practice to equip looms with means for stopping the loom when a warp thread breaks or becomes too slack for weaving purposes, and also to stop the loom when the weft or filling fails to be laid in the shed. Such mechanisms, however, have introduced complications in loom structure, and one of the objects of the present invention is to provide means of simple and few parts for stopping the loom on the occurrence of either a warp or a weft fault.

On the occurrence of a warp fault it isdesirable that the loom be stopped with the lay and shedding mechanism in proper positions for piecing up, and that such stopping of the 100111 shall be effected on the occurrence of a first fault in the warp. Should a fault occur in the weft, however, it is frequently preferable to continue the loom operation for usually three of such weft faults.

a few picks, becausethe weft fault may be cured by the operation of the loom. This is particularly observable where the loom is of the filling replenishing type and where breakage of the weft maytake place during the transfer of the filling carrier to the shuttle. In such cases the cause of the weft breakage may be due to some temporary condition at the replenishing sideof the loom which may be'cured upon the next transfer. Should, however, the breakage of the weft continue consecutively for a number of picks, it indicates some improper functional operation of the loom itself or of the shuttle, sothat on such recurrence of weft breakage the loom must be stopped to investigate the cause of the defect. V

In accordance with one aspect of the present invention. therefore, means are provided toeffectloom stoppage'on the first occurrence of a warp fault and to effect loom stoppage on repeated occurrences ofa weft fault,

A further feature of the present invention consists of a simplification of the mechanisms which effect loom stoppage and to utilize the weft fork mechanism to stop the loom either on the occurrence of a warp or a weft fault.

The invention and new combination of parts will best be made clear from the following description and the accompanying drawings of one good form/thereof;

In the drawings: p

1927. Serial No. 205,065.

Fig. 1 is a side elevation ofa loom containin the present invention, some of the parts being shown insection;

Fig. 2 is an enlarged detached detail showing the weft fork stopping mechanism and the warp fault stopping mechanism in their tion and be provided with the usual crank I shaft'2 having the crank arm 3 connected to the pitman 4 which is itself connected to the lay 5 to impart'thereto the usual beat-up movements.

Extending from the breast beam 6 is the shipper stand 7 having the shipper holding notch 8 which normally acts to retain the shipper 9 in running position, and the shipper, as indicated in Fig. 1, may be pivotally mounted on the bracket 10 at 11, as usual, the construction being such that when the shipper is in the holding notch, the loom will continue to run, but when detached from the holding notch, the shipper will be moyed to stopping position to throwthe power from the loom. I

Pivotally mounted at 12 upon the shipper stand is the shipper knock-off 13, the end portion 14 of which normally rests against the side ofthe shipper, and associated with the shipper knock-off are. the warp control stop mechanism and the weft control stop mechanism.

The weft stop mechanism comprises the stand 15 in whichthe weft fork slide 16 is mounted for movement towards and from the front of the loom. Pivotally mounted on the weftrfork slide 16 at 17 is the weftfork' 18, the frontwardly extending tail portion 19 of which is adapted to be engaged by a hook 20 carried by the weft hammer or cam follower 21, the construction being such that should the weft fork be tilted by engagement witha weft thread as the lay beats up, the hook 20 will not operatively engage thetail 19 of the weft fork and the loom will continue to run, but should the weft fork fail to be tilted owing to the absence of weft, the book will engage the tail of the weft fork and moveithe weftfork and Weft tork slide front- Wardly. The mechanism so far described is of usual character and Well understood.

Mounted loosely upon the Weft fork slide is the controller 22', having a laterally. extending lug 23 and a transversely extending portion which is adapted to rest at times in depressions 25 formed in the Weft fork slide.

The parts, as indicated in Figs. 2 and l Avithrespect to the welit fork mechanism, are

shown in their normal loom operating posi tion. with the controller 22 having the transverse portion 24- r-esting in the front notch 25 the weft t-oi k slid-e, therel 7 notch in the eft fork of the slide. The rear portion o l the controller 22 has a. lug 2t; 'ctendnig 'UPW dly behind a bridge 2'? carried by the We slide, and below the lug 26 is a second lug 28 which is adapted to cngmfe a projection extending upwardly from the stationary weft fork stand 15 when ti o ci -t fork slide is moved iro-ntuardly by i-h failure of .ivett, whereby the controller 22 is arrested in its frontu'ard movement with v positioning the into the middle transverse. projection 22%:

notch 25. I i I The controller 22 has 'a second shoulder 30 which should Weft failure occur on the secit fork slide is moved ironti-vard-ly. Under such conv ditions the lug 31 on the controller 22 engages able the shoulder 00 of the co the front portion of the bridge 27, with the result that the controller 22 is moved frontu rdl-y \vitl the weft tori; slide on the third absence otlilling, and the-lug 23 will engage the end portion of knockoff lev r 13 and detach the shipper from its holding notch to effect loom stoppage. The controller 22 has a lug 35 which normally s upon a lug 36 on the weft iork slide when the parts are in normal po .r n lHltWllEfi the controller is arrested on rs first frontuard mom.- ment the lug 35 drops from the lo to en- \er to meet the projection 29 on the Weft lo stand. it will be understood, oi course, that the Weft fork slide is'normally under the influence oi a spring tending to hold it in its rearward position, anchin the present instance, this spring is shown at 37, one end being secured to a pin 88 onthe Weft fork stand. and the other end secured at39 to the front of the Weft fork slide. e

From the construction thus tar des ribed it will be apparent that upon the first failure movement by yielding means, in which shaft. Extending upwardly be;

which exte of Weft, the Wet-t fork slide will be moved frontwardly by the Weft hammer or cam tollower and the controller 22 will be arrested in its 'lrontward movement with the Weft fork slide to cause the transverse projection 2% to engage the center or the middle notch 25 in the Weft fork slide. Gn the second failure of weft, the controller 22 Will be arrested its frontivard movement With the Weft iork slide by engagement oat its shoulder 39 with the projection 29 and Will thus cause the transverse projection 24 to drop into the deeper notch 25 and position the projection for engagement with the end 3% the knock-oil on the failure of 'vvei't as the we slide is ved i .tivardly end diceted in- Fig. 5. 'ihus loom stoppage cu a weft -fault will occur only tlft'Ql repea -e of Weft a condition which vantageous in filling rep enishing loom The warp stop mechanism is of the t versely movable toothed type, as 1y indicated in Fig. 1. In the present tration oi? the invention, there tour transversely movable toothed detect-or bars $0 each of which is connected to an actuator ll mount-ed ior rock movement upon th shaft l2=and normally held ior such c 7 1 spect tne construction is and may be substantially the same as that shown and described in the Harly A. Davis and Arthur S. Johnson Patent, No. 1 538,625 dated May 19, 1925, to \vhichre'ference may be had for elucid of the details of the Warp stop mecheni Secured to the rock shaft 42 is an arm which receives its motion from i rch rod it which maybe actuated from the lower or cum the cross msm is a member 45 of the vrarp'stop me 7 P I 1 I1 plunger 10 which as more lolly descrioed 1n the Davis and Johnsonpatent actsupon a sheathed Wire transmitter 17 to move the "1T6 longitudinally in its sheath when one oi? transversely movable toothed bar detectors is arrested in its transverse mov' l8 which may be secured to the knee bolt 4-). The bracl-ict 48 extends up. l'ro'm the knock-off end is pro ed 1' 1 laterally CKlGl'iCilIlP' erm @31 di i chin intruder ti s rearu'erdly from the arm oi the bracket between the side portioi the weft tort: slide. and normally held in its raised position under the'influence of means controlled from the Warp stop mechenism, as will now be described.

I Pivotally mounted on the bracket 48 at 53 is the lever 54, the horizontal arm 55 of which extends beneath the arp stop finger 52. The upwardly extending arm of thelever is under the influenceof a spring 56, one end of which is secured by a pine? carried by the bracket 48, and the other end of which is connected to the Upwardlyextendirig arm of the lever 4, as at 58.7 The tension of the spring 56 is such that under normal weav ng conditions the leierM will be held with its arm 55 pressed upwardly against the under side of the warp stop finger 52 to thereby maintain the finger 52 in its upper or inoperative position.

The horizontal arm 55 of the lever 54 1s provided with an abutment 59, Fig. 3, against which bears a plunger 60, the outer end portion of which rests against the sheathed wire 47, which, as hereinbefore noted, will be the absence of weft, so'that on frontward movement of the cam follower or weft ham mer, the warp stop finger 52 will cause the knock-off 13 to be actuated to detach the shipper from its holding notch and efiectloom stoppage.

In the simplification of the weft fork stop mechanism and the warp stop mechanism it will be noted that the warp stop finger 52 moves to its operative engagement with the weft fork mechanism or cam follower in a vertical plane passing through the weft fork or cam follower and between the side portions of the weft fork slide, thereby utilizing the weft fork mechanism to actuate the Warp stop control mechanism to effect loom stoppage.

From the construction hereinbefore described it will be apparent that upon the first occurrence of a warp fault the loom will be stopped through the action of the weft fork mechanism or cam follower, and that upon occurrence of repeated weft faults the loom stopping mechanism will be actuated to stop the loom.

It may be desirable at times to limit the upward movement of the horizontal arm 55 of the lever 54 under the action of the spring 56, and to this end the arm of the bracket 48 is provided with a rearwardly extending stop 61, Fig. 2. This is desirable because on the action of the warp stop mechanism, a slight movement downward of the horizontal arm 55 will cause the end of the warp stop finger 52 to engage the weft fork stop mechanism and effect loom stoppage.

lVhat is claimed is:

In a loom, the combination of loom stopplng mechanism including ashipper and shipper knock-01f, a weft fork stopping mechanism including a weftfork slide, a cam follower for operating the weft fork slide shipper and shipper knock-off, a warp of the stopping mechanism, a controller actuated by the weft fork stopping mechanism to stop the loom only on repeated absence of weft, a warp'stop mechanism having a transversely movable toothed detector bar, and means mounted on the shipper knock-off in position to extendover said slide and con-,

trolled by the transversely movable detector bar to en age the cam follower to effect loom stoppage on the first occurrence of a warp fault without disturbing the position of said slide. 7

2. In a loom, the combination of 100111 stoppin mechanism including a shipper and shipper 'nock-ofl', a weft fork stopping mechanism including a weft fork and weft fork slide, a controller mounted on the weft fork slide and actuated to stop the loom on the third absence of weft, a cam follower to act upon the weft fork, a finger mounted on the shipper knock-off to extend over said slide through the weft fork, a warp stop mechanism comprising a transversely movable toothed detector bar adaptedto be arrested in its transverse movement on the occurrence of a warp fault, and means actuated by stoppage of the transverse movement of the detector bar to position the finger for engagementb the cam follower to stop the loom on the first occurrence of a warp fault.

3. In a loom, weft fork stopping mechanism including a weft fork and weft fork slide, a cam follower adapted toen age the weft fork and move it and the sli e frontwardly on failure of weft to effect loom stoppage, loom stopping mechanism including a stop finger mounted on the shipper knock-off and extending rearwardly in a vertical plane between the sides of the weft fork slide in position for engagement with the'cam follower, a

warp stop mechanism having a transversely movable toothed detector bar, means-normally holding the warp stop finger out of the path of movement of the cam follower and positioned on the occurrence of a warp fault to cause the finger to engage the cam follower and stop the loom.

4. In a loom, the combination of loom stopping mechanism including a. shipper and shipper knock-off, weft fork stopping mechanism including a weftfork slide, a cam follower to engage the weft fork to shift said slide, a warp stopcfinger mounted'on the shipper knock-off to extend over said slide in the vertical weft fork and cam follower, a warp stop mechanism, means controlled by the warp stop mechanism for placing the warp stop finger in position for engagement by the cam follower on the occurrence of a warp fault and operable to stop the 100m without shifting said slide. I

5. In a loom, the combination of loom plane passing through the stopping mechanism including a shipper and shipper knock ofi lever, weft fork stopping mechanism including a hollow weft slide having a weft fork and cam follower the upper 7 end of which reciprocates within the hollow slide, a warp stop finger, mounted on the shipper knock-off in position to extend over said slide, means for normally holding said linger from engagement by the cam follower, a warp stop mechanism having a movable detector bar, and means under thecontrol of shipperknock-oif lever, weft fork stopping mechanism including a hollow weft slide having a weft fork and a cam follower the upper end ofwhieh reciprocates in the hollow slide and has a notch adapted to he engaged by the weft fork, a warp stop finger mounted on the shipper knock-off adjacent said slide, means for normally holding said finger from engagement by the cam follower, a warp stop mechanism having a movable detector bar, andmeans under the control of the Warp stop mechanism for effecting the engagementof said finger with the notch of the cam follower upon the occurrence of a warp fault and oper his to stop the loom. without shifting said slide. I

In testimony whereof,I have signed my name to this specification.

HARRY A. DAVIS. 

